There are numerous files and sources that need to be referenced to when processing a project. There may be videos, images, or even designs that need to be included. There may be a specific strategy document or schedule that needs to be shared. The 'References' tab is where you can share all of the above and more documents in regards to your project. Feel free to keep them organized in folders if you wish to do so. 'References' tab allows all types of file formats.
Videos, images, and PDF files uploaded to 'References' can also be viewed and commented in the same way as any other 'Reviews' file with the exception of the wipTree feature that manages versions.